Stock photo: Pink Bokeh

Pink Bokeh

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16.3cm x 9.1cm at 300dpi
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»  Pink Bokeh
In photography, bokeh (Japanese pronunciation: [boke]) is the blur, or the aesthetic quality of the blur, in out-of-focus areas of an image, or "the way the lens renders out-of-focus points of light."

Differences in lens aberrations and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting—"good" and "bad" bokeh, respectively.

Bokeh occurs for parts of the scene that lie outside the depth of field. Photographers sometimes deliberately use a shallow focus technique to create images with prominent out-of-focus regions.

Bokeh is often most visible around small background highlights, such as specular reflections and light sources, which is why it is often associated with such areas.

However, bokeh is not limited to highlights; blur occurs in all out-of-focus regions of the image.

The term comes from the Japanese word boke (?? or ??), which means "blur" or "haze", or boke-aji (???), the "blur quality". The Japanese term boke is also used in the sense of a mental haze or senility.

The English spelling bokeh was popularized in 1997 in Photo Techniques magazine, when Mike Johnston, the editor at the time, commissioned three papers on the topic for the March/April 1997 issue; he altered the spelling to suggest the correct pronunciation to English speakers, saying "it is properly pronounced with bo as in bone and ke as in Kenneth, with equal stress on either syllable".

The spellings bokeh and boke have both been in use at least since 1996, when Merklinger had suggested "or Bokeh if you prefer."

The term bokeh has appeared in photography books at least since 1998, It is sometimes pronounced /?bo?k?/ (boke-uh).

Although difficult to quantify, some lenses enhance overall image quality by producing more subjectively pleasing out-of-focus areas. Good bokeh is especially important for large-aperture lenses, macro lenses, and long telephoto lenses because they are typically used with a shallow depth of field. Bokeh is also important for medium telephoto "portrait lenses" (typically 85–150 mm on 35 mm format) because in portraiture photography, the photographer typically seeks to obtain a shallow depth of field to achieve an out-of-focus background and make the subject stand out.

Bokeh characteristics may be quantified by examining the image's circle of confusion. In out-of-focus areas, each point of light becomes an image of the aperture, generally a more or less round disc. Depending how a lens is corrected for spherical aberration, the disc may be uniformly illuminated, brighter near the edge, or brighter near the center. Lenses that are poorly corrected for spherical aberration will show one kind of disc for out-of-focus points in front of the plane of focus, and a different kind for points behind. This may actually be desirable, as blur circles that are dimmer near the edges produce less-defined shapes which blend smoothly with the surrounding image. Lens manufacturers including Nikon and Canon make lenses designed with specific controls to change the rendering of the out-of-focus areas.

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»  Uploaded by
caltiva (||)
on Apr 4, 2011
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» Camera: Canon PowerShot SX30 IS
» Exp. time: 1/160 (0.006 secs)
» Aperture: f/5
» Focal length: 92 mm
» ISO speed: 250


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